The CardNinja Ultra-Slim Wallet for iPhone/Android/Blackberry/Windows Smartphones (Steel Gray) is as simple as peeling a sticker. Stick it to your smartphones directly or its case! The CardNinja attaches to your phone using high strength adhesive. It won't come off until you want it to. It holds your cards tightly. Nothing will come out of your CardNinja wallet, even if you flip your phone over.
Whether you carry a bunch of cards with you for work, or just a few to run errands, the CardNinja wallet adapts to you. It's made from a special strong and resilient spandex style material so it stretches to accommodate several cards, but shrinks back down when empty or only carrying a card or two. At only 2.5mm thin, the CardNinja is barely noticeable on your smartphone.